Lambda表达式如何在Java字节码中转换

使用 javap 附加参数可输出有关类的完整信息： javap -v -p -s -c

对于您的示例，lambda的源代码将为：

private static java.lang.Integer lambda$main$0(java.lang.Integer, java.lang.Integer);    descriptor: (Ljava/lang/Integer;Ljava/lang/Integer;)Ljava/lang/Integer;    flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC    Code:      stack=2, locals=2, args_size=2         0: aload_0     1: invokevirtual #17      // Method java/lang/Integer.intValue:()I         4: aload_1     5: invokevirtual #17      // Method java/lang/Integer.intValue:()I         8: imul        9: invokestatic  #2       // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;        12: areturn  LineNumberTable:        line 10: 0      LocalVariableTable:        Start  Length  Slot  Name   Signature 0      13     0     a   Ljava/lang/Integer; 0      13     1     b   Ljava/lang/Integer;}